Anatomy Midterm 2 - Lecture 4.docx

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Western University
Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Michele Barbeau

Gustation and Olfaction ­ breakdown – mechanical and chemical o mastication  o tongue for mechanical and chemical breakdown ­ receptors o respond to chemical stimuli o chemoreceptors are taste receptors ­ bumps are papillae o within papillae are the taste buds ­ circumvallate papillae o back of tongue o make V shape, pretty big ­ foliate papillae o lateral aspect of tongue ­ filiform papillae o spread all over tongue ­ fungiform papillae o larger, at tip of tongue ­ circumvallate papillae o bulgier o flatter on top, rounder on sides ­ foliate papillae o smaller, flat tops, really close to one another ­ filiform papillae o no real beautiful structure ­ fungiform papillae o a bit skinnier, stand alone ­ circumvallate papillae  o tiny little blue buds – these are taste buds o along papillae walls are taste buds ­ foliate papillae (lateral side) o also along papillae walls are taste buds ­ fungiform papillae (anterior aspect) o on apical surface are taste buds ­ kind of like a furrow o fold next to papillae where food falls into ­ food comes into taste pore ­ once entered, then meets the cells o support cells, to keep them nourished o gustatory epithelial cell – or taste receptor cell  cell is derived from epithelial cell o basal cell  blue cells  stem cell like  give rise to future taste receptor cell o cranial nerve fibers  carry information  either • facial nerve • glossopharyngeal nerve • or vagus nerve • depends on where on tongue ­ located throughout tongue ­ and everywhere in mouth ­ taste receptor cells transduce info based on 5 different tastes o bitter  widespread throughout tongue  so you can tell if something has gone bad, or is poisonous  protection o sour o salty o sweet o umami  “deliciousness”  savory – meat, tomatoes o receptors fire, but not as strong, strength dependent on concentration  sends coded message to brain ­ step 1 o cranial nerves carry information o depends on which part of tongue o ex. Facial nerve carries up to medulla  solitary nucleus ­ Step 2 o Relays in solitary nucleus of medulla ­ Step 3 o Axon travels up to ventral posteriomedial nucleus of thalamus o VPM of thalamus ­ Step 4 o Gustatory cortex of insular lobe o ­ nasal concha – 
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